Incandescent lamp and method of manufacture



M. PIPKIN 2,053,164,l

INCANDESCENT LAMB AND METHOD OF MANUFACTURE Sept... l, 193,6.

Filed Dam, 3l, 1951 fNvENfz-DR M1/IN' FIFKIN H115 Afa-'nawak'- are clampedbetween the adjacent ends of saidv tubes. A butt seal is then formed by beating the adjacent edges of the tubes, as by a. gas name.,

Patented Sept. 1, 1936 UNITED STATESy INCANDESCENT LAMP MANUFAC UR Marvin Pipkln, Cleveland Heights,

AND METHOD or'4v r E Ohio, as-

signor to General Electric Company, a corporation of New York Application December 31, 1931, Serial No. 584,062.v

clalms.

-fusing the end of a glass tube to forni the thickened or lens portion and then sealing the filament mount in the hollow portion of the tube. As distinguished from that method, I rst enclose the mount in a tube and then heat the end of the tube and a portion of. a solid body oi. glass to cause them to fuse together. A substantially spherical body such as the ordinary glass marble is preferred'for this purpose. As a, modification, the marble may be iiattened so as to provide a larger space within the completed bulb for the filament. My method provides a very economical and eective method oi making lamps of this character. Other features and advantages of my invention will appear from the following description of a species thereof and from the accompanying drawing.

In the drawing, Fig. l shows the relative posi-v tions oi parts before the sealing-in of the filament mount; Fig. 2 shows the position of parts before the sealing of the lens portion to the body; Fig. 3'shows the lens sealed to' the body;

into which portions of the lead wires i i are sealed,

and outer lead wires i3. `.il pair of glass tubes it and itl are brought together so as to enclose the niement in tube ld while the lead wires i3 while said tubes are revolved to obtain a circs ierential heating, thus sealing in the conductors ibas shown in Fig. 2. The tube l is heated suma glass marble il (Fig. 2) is then heatedv by directing a gas flame thereon andthe tube Il is slowly lbrought up to said marble thus heating up the edge of said tube I4 and sealing it to said marble, as shown in Fig. 3. The marble and tube are revolved during the heating so as to obtain an even distribution of heat. 'I'he lamp is then exhausted through the tube I5 and sealed off at It (Fig. 4), after which it is mounted in a base in the usual manner. Said base comprises a shell i9 containing cement 20 into which the bulb portion of the lamp is set. wires i3 is brought up over the edge of said shell y i9 and soldered thereto at 2B while the other lead wire i3 isbrought through an eyelet 22 which is embedded in insulation 23 in the bottom of the base.

said solder forms a contact 24.

While the marble il' is being heated prior to sealing it to the tube it in Fig. 2, it may be hattened slightly so as toprovide the shape shown in Fig. 6 where the attened portion is .shown at 2E thus obtaining a modied distribution of light.-

As shown in Figs. 5 and 6, the filament of the lamp is located insidezof the base thereby obtaining a very rigid construction. The marble or One of the outer lead 10 Said lower lead I3 is cut oi at the edge of l5 the base and soldered in the eyelet 22' so that lens il may be made of a colored glass in which case the lamp emits a pleasing cold colored light. The lens portion may also be frosted thus providing a lamp of great mechanical strength with adidused light beam.

What I claimas new and desire to secure by Letters Patent oi' the United Statesigs:

l. The method oi manufacturing an electric incandescent lamp which includes enclosing a lila-n ment mount comprising a viilament and supports therefor in a glass tube and then uniting the glass tube to a glass lens by fusing the end edge of said tube and said.- glass lens together.

2. The method of manufacturing an electric incandescent lamp which includes assernb two glass tubes and a nlament mount compr.. r nient and lea-in wires disposed the ends oi' the said tubes, fusing theen l the said tubes together to form a butt seal`enf closing the said lead wires, and then uniting the other end edge of one of said tubes to a solid glass body by fusion. Y

3. The method of manufacturing an electric incandescent lamp which consists in enclosing a lament mount comprising a filament and leading-in wires in a glass tube, uniting the glass tube to a glass lens by fusing the edge of one of the ends of said tube and said glass lens together, exhausting said tube through the other end thereof and sealing-od said end.

4. The method o! manufacturing an electric incandescent lamp which comprises assembling two glass tubes and a filament mount comprising a filament and leading-in wires disposed between 5 theends of the said tubes, fusing the ends of the said tubes together to form a butt seal enclosing the said lead wires, uniting the edge of the other end of one of said tubes to a glass lens by fusion to form s. lament chamber, exhausting said chamber through the open end thereof, and sealing-oi said end.

MARVIN PIPE'N. 

